I don’t believe fedora project discourages use of proprietary stuff.
What they do is refuse to include and distribute any non-open-source software in the project. What the user does after the OS is installed is then up to the user. The user is free to use anything they choose to add onto the distro, but the project thus cannot be held liable for any possible copyright or patent violations encountered.
Your use of the rpmfusion repo and installation of the proprietary drivers is one of the consequences of the policy that the Fedora Project uses. Things that are necessary because of proprietary hardware (or otherwise), but encumbered with proprietary software, have to be available from somewhere so we can use almost any video card, network card, camera, printer, etc. that we choose. Rpmfusion helps satisfy that need as do many of the hardware manufacturers.
HP, Xerox, Canon, etc. mostly have some proprietary software needed to fully use their printers. Yet with a little bit of extra work all but the very newest of devices are mostly available for use with linux.
Would you want to be limited in what you use simply because the hardware or software is proprietary?
Would you want to have the Fedora Project shut down because of a copyright or patent violation?
The project does not discourage use of proprietary stuff. They just cannot distribute it as part of the OS and thus allow you as the end user to tailor things as you need and see fit.
In the case of nvidia video cards, the hardware is proprietary, the drivers to support them are also proprietary, yet nvidia does directly allow download of the driver software to support their cards on linux. What rpmfusion does is some minor tweaks to ensure everything works for each kernel and then packages the software so the end user is able to download the rpm and install the binary files so it just works. You as the end user thus do not have to twiddle with the sometimes incompatible drivers and maybe even recompile part of what was downloaded from nvidia before your card works.